Mr. Johnson is a Managing Member of Apex Management IV, LLC, which is the sole general partner of Apex Investment Fund IV, L.P. and the Manager of Apex Strategic Partners IV, LLC. Mr. Johnson is also a Member of Apex Management V, LLC, the sole general partner of Apex Investment Fund V, L.P. Mr. Johnson shares voting and dispositive power over the securities held by these funds. Mr. Johnson disclaims beneficial ownership of the reported securities except to the extent of his pecuniary interests therein.